{"id":458903,"date":"2026-05-27T09:01:40","date_gmt":"2026-05-27T09:01:40","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ewf-dpm-coupling-2\/"},"modified":"2026-05-27T09:01:40","modified_gmt":"2026-05-27T09:01:40","slug":"ewf-dpm-coupling-2","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ewf-dpm-coupling-2\/","title":{"rendered":"EWF DPM coupling"},"content":{"rendered":"<p>&lt;p&gt;I am using a UDF to trap\/stick DPM particles when they hit the wall. After that, I want to use the trapped particle mass and momentum as source terms for the Eulerian Wall Film model.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/05\/27-05-2026-1779872357-mceclip1.png\" \/>&lt;\/p&gt;&lt;p&gt;If I provide the wall-film momentum source using a UDF, should I consider particle and film velocity in udf to get momentum source? if yes, how can I access the Eulerian Wall Film velocity inside a UDF? Is there a specific macro for film velocity on a wall face? or how can i calculate it?&nbsp;&lt;\/p&gt;&lt;p&gt;Since the wall film flows parallel to the wall surface, should I use only the tangential component of particle velocity in the momentum source, instead of the full particle velocity?&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-458903","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["458903"],"_bbp_subscription":["73128"],"_bbp_author_ip":["129.94.96.148"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["458903"],"_bbp_last_active_time":["2026-05-27 09:01:40"],"_bbp_reply_count":["0"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["1"],"_bbp_engagement":["73128"],"_btv_view_count":["13"],"_bbp_topic_status":["unanswered"]},"test":"z5489721ad-unsw-edu-au"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/458903","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/458903\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=458903"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}